stylus/content/install-user-css.css

body {
  margin: 0;
  font: 12px arial, sans-serif;
}

* {
  box-sizing: border-box;
}

.container {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

.header {
  width: 280px;
  padding: 15px;
  border-right: 1px dashed #aaa;
  box-shadow: 0 0 50px -18px black;
}

.header h1:first-child {
  margin-top: 0;
}

h1 small {
  font-size: 0.6em;
}

.warning {
  padding: 3px 6px;
  border: 1px dashed black;

  border-color: #ef6969;
  background: #ffe2e2;
}

.header .warning {
  margin: 3px 0;
}

.actions {
  margin: 15px 0;
}

.actions > * {
  display: inline-block;
}

.external {
  text-align: center;
}

.external > * {
  margin: 0 7.5px;
}

button.install {
  display: block;
  margin: 0 auto;
  font-size: 2em;
  padding: 0.4em 0.8em;
}

.code {
  padding: 2em;
  font-family: monospace;
  white-space: pre-wrap;
}